1 // SPDX-License-Identifier: GPL-2.0-only 2 /* Copyright (c) 2010-2011,2013-2015 The Linux Foundation. All rights reserved. 3 * 4 * max98357a.c -- MAX98357A ALSA SoC Codec driver 5 */ 6 7 #include <linux/acpi.h> 8 #include <linux/device.h> 9 #include <linux/err.h> 10 #include <linux/gpio.h> 11 #include <linux/gpio/consumer.h> 12 #include <linux/kernel.h> 13 #include <linux/mod_devicetable.h> 14 #include <linux/module.h> 15 #include <linux/of.h> 16 #include <linux/platform_device.h> 17 #include <sound/pcm.h> 18 #include <sound/soc.h> 19 #include <sound/soc-dai.h> 20 #include <sound/soc-dapm.h> 21 22 static int max98357a_daiops_trigger(struct snd_pcm_substream *substream, 23 int cmd, struct snd_soc_dai *dai) 24 { 25 struct gpio_desc *sdmode = snd_soc_dai_get_drvdata(dai); 26 27 if (!sdmode) 28 return 0; 29 30 switch (cmd) { 31 case SNDRV_PCM_TRIGGER_START: 32 case SNDRV_PCM_TRIGGER_RESUME: 33 case SNDRV_PCM_TRIGGER_PAUSE_RELEASE: 34 gpiod_set_value(sdmode, 1); 35 break; 36 case SNDRV_PCM_TRIGGER_STOP: 37 case SNDRV_PCM_TRIGGER_SUSPEND: 38 case SNDRV_PCM_TRIGGER_PAUSE_PUSH: 39 gpiod_set_value(sdmode, 0); 40 break; 41 } 42 43 return 0; 44 } 45 46 static const struct snd_soc_dapm_widget max98357a_dapm_widgets[] = { 47 SND_SOC_DAPM_OUTPUT("Speaker"), 48 }; 49 50 static const struct snd_soc_dapm_route max98357a_dapm_routes[] = { 51 {"Speaker", NULL, "HiFi Playback"}, 52 }; 53 54 static int max98357a_component_probe(struct snd_soc_component *component) 55 { 56 struct gpio_desc *sdmode; 57 58 sdmode = devm_gpiod_get_optional(component->dev, "sdmode", GPIOD_OUT_LOW); 59 if (IS_ERR(sdmode)) 60 return PTR_ERR(sdmode); 61 62 snd_soc_component_set_drvdata(component, sdmode); 63 64 return 0; 65 } 66 67 static const struct snd_soc_component_driver max98357a_component_driver = { 68 .probe = max98357a_component_probe, 69 .dapm_widgets = max98357a_dapm_widgets, 70 .num_dapm_widgets = ARRAY_SIZE(max98357a_dapm_widgets), 71 .dapm_routes = max98357a_dapm_routes, 72 .num_dapm_routes = ARRAY_SIZE(max98357a_dapm_routes), 73 .idle_bias_on = 1, 74 .use_pmdown_time = 1, 75 .endianness = 1, 76 .non_legacy_dai_naming = 1, 77 }; 78 79 static const struct snd_soc_dai_ops max98357a_dai_ops = { 80 .trigger = max98357a_daiops_trigger, 81 }; 82 83 static struct snd_soc_dai_driver max98357a_dai_driver = { 84 .name = "HiFi", 85 .playback = { 86 .stream_name = "HiFi Playback", 87 .formats = SNDRV_PCM_FMTBIT_S16 | 88 SNDRV_PCM_FMTBIT_S24 | 89 SNDRV_PCM_FMTBIT_S32, 90 .rates = SNDRV_PCM_RATE_8000 | 91 SNDRV_PCM_RATE_16000 | 92 SNDRV_PCM_RATE_32000 | 93 SNDRV_PCM_RATE_44100 | 94 SNDRV_PCM_RATE_48000 | 95 SNDRV_PCM_RATE_88200 | 96 SNDRV_PCM_RATE_96000, 97 .rate_min = 8000, 98 .rate_max = 96000, 99 .channels_min = 1, 100 .channels_max = 2, 101 }, 102 .ops = &max98357a_dai_ops, 103 }; 104 105 static int max98357a_platform_probe(struct platform_device *pdev) 106 { 107 return devm_snd_soc_register_component(&pdev->dev, 108 &max98357a_component_driver, 109 &max98357a_dai_driver, 1); 110 } 111 112 static int max98357a_platform_remove(struct platform_device *pdev) 113 { 114 return 0; 115 } 116 117 #ifdef CONFIG_OF 118 static const struct of_device_id max98357a_device_id[] = { 119 { .compatible = "maxim,max98357a" }, 120 {} 121 }; 122 MODULE_DEVICE_TABLE(of, max98357a_device_id); 123 #endif 124 125 #ifdef CONFIG_ACPI 126 static const struct acpi_device_id max98357a_acpi_match[] = { 127 { "MX98357A", 0 }, 128 {}, 129 }; 130 MODULE_DEVICE_TABLE(acpi, max98357a_acpi_match); 131 #endif 132 133 static struct platform_driver max98357a_platform_driver = { 134 .driver = { 135 .name = "max98357a", 136 .of_match_table = of_match_ptr(max98357a_device_id), 137 .acpi_match_table = ACPI_PTR(max98357a_acpi_match), 138 }, 139 .probe = max98357a_platform_probe, 140 .remove = max98357a_platform_remove, 141 }; 142 module_platform_driver(max98357a_platform_driver); 143 144 MODULE_DESCRIPTION("Maxim MAX98357A Codec Driver"); 145 MODULE_LICENSE("GPL v2"); 146